hgweb: shorten all the URLs in the standard templates
A URL like this:
http://www.selenic.com/hg/?cmd=changeset;node=5010207c35273ac1331cae44c253dd41fa07cb7f
is now presented as:
http://www.selenic.com/hg/?cs=5010207c352
(though the old style still works, of course)
#header#
<title>Mercurial repositories index</title>
</head>
<body>
<h2>Mercurial Repositories</h2>
The specified repository "#repo#" is unknown, sorry.
Please go back to the main repository list page.
#footer#